The lunge had been unsuccessful, knocking him into the wall. Then the pain in his body, nearly giving out on him. He went back and forth in his mind with the pain, before the beast came out even stronger. Yes he was still in pain but he had enough strength to whip around knock Lucius of his balance and to the floor.
The pain had subsided some what so he was able to stand up and shake himself off. Lucius would be up in less than a few seconds so Ambrose rushed him holding him to the wall by his neck. He could easily kill him, but he was not that monster anymore. His eyes lessened in there intensity, but that would mean Lucius would take that as a weakness. Ambrose let his neck go enough for Lucius to breath.